At a White House meeting with Palestinian leader Mahmoud Abbas, Trump pledged to reinvigorate the stalled Mideast peace process that has bedeviled his predecessors and said he would serve as “a mediator, an arbitrator or a facilitator” between the two sides. “We will get it done,” Trump confidently told Abbas.

“I’m committed to working with Israel and the Palestinians to reach an agreement,” Trump said. “But any agreement cannot be imposed by the United States or by any other nation. The Palestinians and Israelis must work together to reach an agreement that allows both peoples to live, worship, and thrive and prosper in peace.”

The source of Trump’s optimism was not immediately apparent. He offered no details about his effort or how it would be any different from attempts over the past two decades. Former Presidents Bill Clinton, George W. Bush and Barack Obama all tried and failed.

The peace process has been stalled since 2014, and there have been no serious attempts to restart negotiations.

Like previous U.S. leaders, Trump faces numerous obstacles in the long-shot bid. They include the contours of a potential Palestinian state, Jerusalem’s status and the question of Palestinian refugees. Complicating it all are the vehement Palestinian criticisms of Israeli settlement construction and Israeli complaints that Palestinians are inciting violence.

Abbas insisted he is committed to peace, but he made clear Palestinian demands for a separate state based on borders that existed before the 1967 Mideast war, a capital in east Jerusalem and the return of Palestinian refugees.

“Our strategic option, our strategic choice is to bring about peace based on the vision of two states, a Palestinian state, with its capital of east Jerusalem, that lives in peace and stability with the state of Israel based on the borders of 1967,” he said.

Israel rejects the 1967 lines as a possible border, saying it would impose grave security risks. Israel also opposes Palestinian demands on refugees and stakes its claim on an undivided Jerusalem as the capital of the Jewish state.

Trump did not discuss any of those issues Wednesday. But in a February news conference with Israeli Prime Minister Benjamin Netanyahu, Trump broke with longtime U.S. policy by raising the idea of a one-state peace agreement, withholding clear support for an independent Palestine. U.S. officials quickly stressed afterward that Trump would support any arrangement agreed by the two sides.

U.S. officials had said ahead of Wednesday’s meeting that Trump would press Abbas to end payments to families of Palestinians imprisoned in Israeli jails. But Trump didn’t specifically mention that issue in his brief remarks after the Oval Office session.

The stipends are sensitive. Israel considers such payments a reward for terrorists. Stopping them seems untenable to Abbas, especially at a time of broad Palestinian support for a mass hunger strike of prisoners held by Israel.

American officials said such a request was raised in preparatory talks with Palestinian officials. Three Republican senators urged a halt to such payments in a letter to Trump that reflected widespread opinion in Congress. The Palestinians consider the stipends as welfare payments for victims of Israeli occupation.

Trump did directly implore the Palestinian leadership to end what Israel and the United States say is anti-Israel rhetoric.

“There can be no lasting peace unless the Palestinian leaders speak in a unified voice against incitement to violate, and violence, and hate,” the president said. “There’s such hatred, but hopefully there won’t be such hatred for very long.”

In his comments, Abbas praised Trump for his “leadership,” “courageous stewardship,” ”wisdom” and “great negotiating ability.”

Abbas said Palestinians are not cultivating a hatred of Israel as he rejected Trump’s position, which is also held by Netanyahu.

“I affirm to you that you are raising our youth, our children, our grandchildren on a culture of peace,” Abbas said.

More in Trump Administration

Colorado Attorney General Phil Weiser has filed a legal brief in support of stronger vehicle fuel-efficiency standards, saying the state recently adopted its own rules because the Trump administration is pushing for weaker ones.

The Trump administration said Tuesday that it plans to cancel $929 million awarded to California's high-speed rail project and wants the state to return an additional $2.5 billion that it has already spent.

Senior White House officials pushed a project to share nuclear power technology with Saudi Arabia despite the objections of ethics and national security officials, according to a new congressional report citing whistleblowers within the Trump administration.